there are over two dozens definitions of enlightenment. Daniel Ingram’s books mctb (master core teachings of buddha) has a long section exploring different definitions or models.
i personally think 24 hour consciousness around the clock is a scientifically verifiable definition. another verifiable definition is capacity to exhibit constant delta wave while awake, as well as access to various advanced states on demand. (this distinguishes peak states and permanent traits) see ken wilber’s brainwave video on youtube to get an idea.
enlightenment does not equal panacea or lack of personal flaws. this is one of the thing that confuses so many people and got cleared out only in the last 30 years or so.